<script setup lang="ts">
import type { UploadProps, UploadUserFile } from "element-plus";
import { ElMessage } from "element-plus";

defineOptions({
  name: "FileUpload",
});

const props = withDefaults(
  defineProps<{
    action: UploadProps["action"];
    headers?: UploadProps["headers"];
    data?: UploadProps["data"];
    name?: UploadProps["name"];
    size?: number;
    max?: number;
    files?: UploadUserFile[];
    notip?: boolean;
    ext?: string[];
  }>(),
  {
    name: "file",
    size: 2,
    max: 3,
    files: () => [],
    notip: false,
    ext: () => ["zip", "rar","pgm"],
  }
);

const emits = defineEmits<{
  onSuccess: [res: any, file: UploadUserFile, fileList: UploadUserFile[]];
  beforeUpload: [fileName: any]
}>();

const beforeUpload: UploadProps["beforeUpload"] = (file) => {
  const fileName = file.name.split(".");
  const fileExt = fileName.at(-1) ?? "";
  const isTypeOk = props.ext.includes(fileExt);
  const isSizeOk = file.size / 1024 / 1024 < props.size;
  if (!isTypeOk) {
    ElMessage.error(`上传文件只支持 ${props.ext.join(" / ")} 格式！`);
  }
  if (!isSizeOk) {
    ElMessage.error(`上传文件大小不能超过 ${props.size}MB！`);
  }
  emits("beforeUpload", fileName)
  return isTypeOk && isSizeOk;
};

const onExceed: UploadProps["onExceed"] = () => {
  ElMessage.warning("文件上传超过限制");
};
const onSuccess: UploadProps["onSuccess"] = (res, file, fileList) => {
  emits("onSuccess", res, file, fileList);
};

</script>

<template>
  <ElUpload
    :headers="headers"
    :action="action"
    :data="data"
    :name="name"
    :before-upload="beforeUpload"
    :on-exceed="onExceed"
    :on-success="onSuccess"
    :file-list="files"
    :limit="max"
    drag
  >
    <div class="slot">
      <SvgIcon name="i-ep:upload-filled" class="el-icon--upload" />
      <div class="el-upload__text">将文件拖到此处，或<em>点击上传</em></div>
    </div>
    <template #tip>
      <div v-if="!notip" class="el-upload__tip">
        <div style="display: inline-block">
          <ElAlert
            :title="`上传文件支持 ${ext.join(' / ')} 格式，单个文件大小不超过 ${size}MB，且文件数量不超过 ${max} 个`"
            type="info"
            show-icon
            :closable="false"
          />
        </div>
      </div>
    </template>
  </ElUpload>
</template>

<style lang="scss" scoped>
:deep(.el-upload.is-drag) {
  display: inline-block;

  .el-upload-dragger {
    padding: 0;
  }

  &.is-dragover {
    border-width: 1px;
  }

  .slot {
    width: 300px;
    padding: 30px 0;
  }
}
</style>
